Hi, I'm a newbie of Drools Fusion. I have a requirement as following: If Event A is inserted into the working memory and in the following 5 seconds there is no Event B, some action will be performed. Here is my rule script import com.foo.event.Event rule "test" when $event1 : Event(eventNo == "A") Event(eventNo == "B", this not startedby [5s] $event1 ) then System.out.println("there is no Event B in 5 seconds"); end Java code: session.insert( event1 ); clock.advanceTime( 6, TimeUnit.SECONDS ); session.insert(event2); session.fireAllRules(); this works. But if i do not insert event2 and the rule will not be fired. I also tried not Event(eventNo == "B", this startedby [5s] $event1 ) not work also Thanks -- View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/CE-not-tp1771908p1771... Sent from the Drools - User mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users

Now I understand I should use a "not" CE here. But following 4 code blocks return same result: no printing 1. session.insert( event1 ); clock.advanceTime( 3, TimeUnit.SECONDS ); session.insert(event2); session.fireAllRules(); 2. session.insert( event1 ); clock.advanceTime( 3, TimeUnit.SECONDS ); //session.insert(event2); session.fireAllRules(); 3. session.insert( event1 ); clock.advanceTime( 6, TimeUnit.SECONDS ); session.insert(event2); session.fireAllRules(); 4. session.insert( event1 ); clock.advanceTime( 6, TimeUnit.SECONDS ); //session.insert(event2); session.fireAllRules(); Thanks -- View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/CE-not-tp1771908p1772... Sent from the Drools - User mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users